My handy redhorse cheat sheet from moxostoma.com tells me shortheads spawn at 47 degrees and silvers at 56. But with the rapid temperature increase this spring, our local stream was at a given temp for maybe just one day. Might they have a short or nonexistent spawn this year? Or is the spawn temp just a minimum and they'll continue to spawn pretty regularly?
My biological indicators (flower blooms, dragonflies returning, bat activity) are running two to four weeks ahead of past years. What other effects might you foresee?